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A customer wants to heat his attached 3 1/2 car garage so that his pet can live there. should the unit have a outside air kit? the home is new and well insulated, and is located in the upper midwest. it will be a natural gas unit.Thanks for your input.

the garage is 31/2 car with 10' ceilings. the unit will be suspended naer the ceiling. units ar avaliable with power venting only, and with power vent and outside combustion air. the home is new and well insulated, and the garage doors are weatherstriped. the area above the garage is living space. we expect to use a 60-75000 btu unit. my question really is because of the pet and tight construction is it best to use the outside combustion air model or is it a non issue? thanks again.